I have concocted a solution that we have not built yet. Would like some input prior to launching into it.
Project: South (to South West) Bed for cold sensitive plants
Idea: Build raised bed next to brick fireplace (Hugel?). Use rocket mass heater for one or two sides retaining wall. Have three sided, removable light, permeable winter cover that is a pathway wider on two sides than the bed. (Open side opposite fireplace.) Dwarf trees to be planted on bed with small shrubs, vines, herbs (citrus, figs, guavas, plumeria, lilakoi, kiwi, etc.). Clay potted items to placed on or next to heat conducting retaining wall.
Feedback from others experiences most appreciated!